I'm new to cloudant and still figuring out various APIs that it provides for access and retrieval.
So far, I've used findbyIndex using selector string which returns JSON as de-serialised object of the POJO supplied.
For a certain use case which I'm working- I need to get JSON only and not the de-seralised object. Is there any way or API from which I can get the actual cloudant doc as JSON only ?
If you know the ID of the document you want to read only the raw JSON, you can use the find method to get the raw inputstream from the request. Currently using the findByIndex method you can only get a deserialised java object back, so you could always use a Map object for your POJO. Although that being said it might be possible to pass the type String for the class to deserialise, however I have not tested this.
Related
I am using Blueprism to make an API Call. The response is a block of json. I need to extract the conversationId from:
{"results":[{"group":{"queueId":"aad701ad-56db-452e-8b70-aa9abd6046c7","mediaType":"email"},"data":[{"metric":"oWaiting","stats":{"count":1},"truncated":false,"observations":[{"observationDate":"2022-01-20T11:19:04.882Z","conversationId":"116b9f91-bf82-4275-9cdc-c405068b4cba","sessionId":"f97de11e-eb99-4781-ae13-33a9e5b6c3f0","routingPriority":0,"direction":"inbound","addressFrom":"e.mc#gmail.ie","addressTo":"info#gmail.ie","requestedRoutings":["Standard"]}]}]}]}
I am using this regex:
^.*? with conversationId ([a-f0-9]+)
but it is not working. Is this the best approach? Is there a better way to do this?
.*conversationId":"([^"]+)".*
will save the conversationId into capture group 1.
If you are using perl, you could do this:
s/.*conversationId":"([^"]+)".*/\1/
this works for your example but it's probably not going to scale well to different input JSON messages. As others have mentioned, the right way to do this is to parse the string into a native JSON object and then extract the field using it's methods.
Ultimately I was going about this the wrong way. I should have been parsing the json and not trying to extract a particular string.
Blueprism has a json object which completes this very function.
https://digitalexchange.blueprism.com/dx/entry/3439/solution/utility---json
I was expecting a JSON string while testing an API using Postman, but instead got this:
{city=Shanghai, work=112-454-7895, fax=788-899-7899}
Obviously I cannot put that into Google and ask what format is it, hence I am asking it here. Postman also says it is a 'bad string'.
I have never seen the above data serialization format. If someone can point the format out to me I would be able to find and use a converter. Additional suggestion with converting it to POJO or JSON are welcome as well.
I figured out that the above format is a stringified version of a HashMap<String, String>, and that there is no direct way to convert it into JSON/POJO. Converting it into json string requires additional work but is fairly straightforward.
I need to parse the jax-ws rest response and I tried the following two ways of parsing the response.Both works good.But I am in need to know the best efficient way of implementation.Please provide me your view.
First Approach:
Use getEntity Object and get the response as Input Stream.
Using Jackson ObjectMapper readValue() -covert the inputstream to java
object.
Using getters and setters of nested java class get the response objects member values.
Second Approach:
Use getEntity Object and get the response as Input Stream and and
convert the Input Stream to String.
Using Google Json API,convert the string to json object.
Using Json parser and get the nested objects member values.
I would say the first approach is better for two reasons:
You don't go through the intermediate process of reading the response payload into String
The setter methods that are called during Jackson deserialization may perform validation on input and throw appropriate exceptions, so you do validation during deserialization.
Maybe not a general answer to this question but another variant of what you're describing under "First approach". I would start with a generic data structure and would only introduce an extra bean if necessary. I wouldn't use String to pass structured data around.
Use jackson to convert the JSON response to a
Map<String,Object> or JsonNode.
Advantage:
You don't need to implement a specialized bean class. Even a very simple bean can become unhandy over time (if format changes or new nested structures are added to the json response, etc.). It also introduces some kind of metaphor to your code which sometimes helps but also can be misleading.
Map<String,Object> is in the JDK and offers a good interface to access data. You don't have to change any interfaces even if the JSON format changes.
You can always pass your data in form of a Map<String,Object>
Disadvantage
Data Encapsulation. The map is a very close representation of the input data and therefore offers not same level of abstraction like a bean.
I'm building a REST API in JAVA and C# and I was wondering about the way I should pass data to those services.
What I'm familiar with as the right way is to send JSON object as the data in the POST body:
{name:'Dor'}
but I can also pass a string and parse the JSON in my service:
'{name:'Dor'}'
What is the preferable way from performance factor? or any other factors?
Basically, if you need to send the json data across via jquery, then we need to use stringify, else the data would be serialized into to key=value pair.
So, you cannot send the json object directly via jquery ajax method.
How it works behind the hood:
In $.ajax function, if we provide data as
data :{key1:"value1", key2:"value2"}
is serialized to key1=value1&key2=value2
if we provide data as
data :'{key1:"value1", key2:"value2"}' or JSON.stringify({key1:"value1", key2:"value2"})
is sent as {key1:"value1", key2:"value2"}
So, what we can conclude is that, we cannot pass json object directly via jquery, we can send only json string. Hope this clarifies everyone.
There's a bit of work to set the stage, so please bear with me...
I'm using knockout to databind a rather deeply nested data structure. When I retrieve the data from the database (from MongoDB using the Mongo C# Driver) there are nested properties (of type List<T>) that aren't populated and are returned as null. I'm using the ServiceStack.Text .ToJson extension method to serialize this data structure to JSON that gets passed to the client for knockoutMapper to convert into my observable viewModel. All goes well, except for the List<T> properties that were null on the server. Since they arrive at the client with a null value, knockoutMapper just makes them observables instead of observableArrays. Now for the question... Is there any way to tell ServiceStack that I want any property of type List<T> that is empty to be serialized as an empty array? I've dug through the JsConfig object to find a setting that looks like it might help but haven't had any luck. Am I missing something in JsConfig or is this something I should be doing in knockoutMapping on the client?
EDIT: Just a note - this is a side project where I'm learning 3-4 new technologies and I have come to see how absurd it is to retrieve JSON from Mongo, use the C# driver to convert this to a POCO to work with it on the server, then to use serviceStack to serialize the POCO as JSON. I plan on changing this with a straight through shot of just JSON, but this is a learning process for me.